First add one parameter in your report.
and drag it to report.
if you are using another page of report then send the page value using query string.
get that query string on form to and store it in variable like
string TYP = Request.QueryString["TYP"];
and then pass value to parameter like this
crystalReport.SetDataSource(dt);
crystalReport.SetParameterValue("TYPE", TYPE);
CrystalReportViewer1.ReportSource = crystalReport;
crystalReport is an object of ReportDocument.
TYPE is name of parameter declare on report.
I hope you got it.